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3 years ago

Need help on Chemistry

Chemistry

1 answer:

avanturin [10]3 years ago

8 0

You may find bellow the balanced chemical reactions.

Explanation:

To balance chemicals equation the number of atoms of each element

entering the reaction have to be equal to the number of atoms of each

element leaving the reaction, in order to conserve the mass.

2. Single displacement: Zn + 2 HCl → ZnCl₂ + H₂

3. Decomposition: NiCl₂ → Ni + Cl₂

4. Double displacement: 2 LiI + Pb(NO₃)₂ → PbI₂ + 2 LiNO₃

5. Double displacement: BaCl₂ + H₂SO₄ → BaSO₄ + 2 HCl

6. Single displacement: Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

7. Synthesis (combination): 2 Na + O₂ → 2 Na₂O

8. Solid mercury (II) oxide decomposes to form liquid mercury and oxygen.

2 HgO (s) → 2 Hg (l) + O₂ (g) (decomposition reaction)

9. A solution of zinc hydroxide reaction with phosphoric acid (H₃PO₄) to produce solid zinc phosphate and water.

3 Zn(OH)₂ + 2 H₃PO₄ → Zn₃(PO₄)₂ (s) + 6 H₂O (l) (double displacement reaction)

where:

(s) - solid

(l) - liquid

Learn more about:

types of chemical reactions

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When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital, a photon of approximate wavelength 6

Mariulka [41]

Answer:

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

Explanation:

Wavelength of the photon emitted = $\lambda =646.3 nm =646.3\times 10^{-9} m$

Energy of the photon will corresponds to the energy difference between 2p and 2s orbital = E

Energy of the photon is given by Planck's equation:

$E=\frac{hc}{\lambda }$

h = Planck's constant = $6.626\tiomes 10^{-34} Js$

c = Speed of the light = $3\times 10^8 m/s$

$E=\frac{6.626\tiomes 10^{-34} Js\times 3\times 10^8 m/s}{646.3\times 10^{-9} m}$

$E=3.07\times 10^{-19} J$

The energy difference between these 2p and 2s orbitals is $3.07\times 10^{-19} J$

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3 years ago

The principal ingredient of glass is ______________________.

Lilit [14]

The principal ingredient of glass is quartz sand (SiO₂).

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3 years ago

when acceleration is held constant and objects of different mass are observed,are mass and force directly proportional or invers

svetoff [14.1K]

Yes. When two things are directly prortional, that means that as one increases, the other increases at the same rate. So, say you have a 2kg object at an acceleration of 2m/s^2. The force would be 4N. If you have a 3kg object at an acceleration of 2m/s^2, the force would be 6N. If two things are inversely proportional, that means that as one thing increases the other decreases at the same rate. A good example of this is in a chemical reaction. If you increase the surface area of the reactants, the reaction time decreases. They are inversely proportional.

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2 years ago

What some everyday ways we use nuclear power? What are the pros and cons of using nuclear power? (Three each)

eimsori [14]

Answer:

Explanation:

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2 years ago

The following combinations are not allowed. If n and ml are correct, change the l value to create an allowable combination:

motikmotik

The allowable combination for the atomic orbital is n=3, l=1, $m_{l}$ =-1.

<h3>What are the three quantum numbers of an atomic orbital?</h3>

Three quantum numbers specify an atomic orbital:

- The principal quantum number, n, which is a positive integer, describes the relative size of the orbital and its distance from the nucleus.

- l is the angular momentum quantum number that is related to the shape of the orbital; l is an integer from 0 to n-1 (so n limits l ),

- $\boldsymbol{m}_{l}$ is the magnetic quantum number that prescribes the three-dimensional shape of the orbital around the nucleus; $m_{l}$ values are integers from -l to =l(l limits ml)

For n = 3, l can have three values: 0, 1, and 2. Since $m_{l}$ values are integers from -l to 0 to +l, for l = 0 the value of $m_{l}$ cannot be -1 (l = 0 has $m_{l}$ = 0).

There are two l values that are consistent with n and $m_{l}$ values:

l=1 or 2

Therefore, the allowable condition is n=3, l=1, $m_{l}$ =-1.

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1 year ago